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From George Stathis <gstat...@gmail.com>
Subject Re: org.apache.hadoop.hbase.mapreduce.Export fails with an NPE
Date Fri, 09 Apr 2010 21:31:30 GMT
RTFMing
http://hadoop.apache.org/hbase/docs/current/api/org/apache/hadoop/hbase/mapreduce/package-summary.html
right
now...Hadoop classpath not being set properly could be the issue...

On Fri, Apr 9, 2010 at 5:26 PM, George Stathis <gstathis@gmail.com> wrote:

> Hi folks,
>
> I hope this is just a newbie problem.
>
> Context:
> - Running 0.20.3 tag locally in pseudo cluster mode
> - $HBASE_HOME is in env and $PATH
> - Running org.apache.hadoop.hbase.mapreduce.Export in the shell such as: $
> hbase org.apache.hadoop.hbase.mapreduce.Export channels /bkps/channels/01
>
> Symptom:
> - Getting an NPE at
> org.apache.hadoop.hbase.mapreduce.TableInputFormatBase$TableRecordReader.restart(TableInputFormatBase.java:110):
>
> [...]
> 110      this.scanner = this.htable.getScanner(newScan);
> [...]
>
> Full output is bellow. Not sure why htable is still null at that point.
> User error?
>
> Any help is appreciated.
>
> -GS
>
> Full output:
>
> $ hbase org.apache.hadoop.hbase.mapreduce.Export channels /bkps/channels/01
> 2010-04-09 17:13:57.407::INFO:  Logging to STDERR via
> org.mortbay.log.StdErrLog
> 2010-04-09 17:13:57.408::INFO:  verisons=1, starttime=0,
> endtime=9223372036854775807
> 10/04/09 17:13:58 DEBUG zookeeper.ZooKeeperWrapper: Read ZNode
> /hbase/root-region-server got 192.168.1.16:52159
> 10/04/09 17:13:58 DEBUG client.HConnectionManager$TableServers: Found ROOT
> at 192.168.1.16:52159
> 10/04/09 17:13:58 DEBUG client.HConnectionManager$TableServers: Cached
> location for .META.,,1 is 192.168.1.16:52159
> 10/04/09 17:13:58 DEBUG client.HConnectionManager$TableServers: Cached
> location for channels,,1270753106916 is 192.168.1.16:52159
> 10/04/09 17:13:58 DEBUG client.HConnectionManager$TableServers: Cache hit
> for row <> in tableName channels: location server 192.168.1.16:52159,
> location region name channels,,1270753106916
> 10/04/09 17:13:58 DEBUG mapreduce.TableInputFormatBase: getSplits: split ->
> 0 -> 192.168.1.16:,
> 10/04/09 17:13:58 INFO mapred.JobClient: Running job: job_201004091642_0009
> 10/04/09 17:13:59 INFO mapred.JobClient:  map 0% reduce 0%
> 10/04/09 17:14:09 INFO mapred.JobClient: Task Id :
> attempt_201004091642_0009_m_000000_0, Status : FAILED
> java.lang.NullPointerException
>  at
> org.apache.hadoop.hbase.mapreduce.TableInputFormatBase$TableRecordReader.restart(TableInputFormatBase.java:110)
> at
> org.apache.hadoop.hbase.mapreduce.TableInputFormatBase$TableRecordReader.init(TableInputFormatBase.java:119)
>  at
> org.apache.hadoop.hbase.mapreduce.TableInputFormatBase.createRecordReader(TableInputFormatBase.java:262)
> at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:588)
>  at org.apache.hadoop.mapred.MapTask.run(MapTask.java:305)
> at org.apache.hadoop.mapred.Child.main(Child.java:170)
>
> 10/04/09 17:14:15 INFO mapred.JobClient: Task Id :
> attempt_201004091642_0009_m_000000_1, Status : FAILED
> java.lang.NullPointerException
> at
> org.apache.hadoop.hbase.mapreduce.TableInputFormatBase$TableRecordReader.restart(TableInputFormatBase.java:110)
>  at
> org.apache.hadoop.hbase.mapreduce.TableInputFormatBase$TableRecordReader.init(TableInputFormatBase.java:119)
> at
> org.apache.hadoop.hbase.mapreduce.TableInputFormatBase.createRecordReader(TableInputFormatBase.java:262)
>  at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:588)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:305)
>  at org.apache.hadoop.mapred.Child.main(Child.java:170)
>
> 10/04/09 17:14:21 INFO mapred.JobClient: Task Id :
> attempt_201004091642_0009_m_000000_2, Status : FAILED
> java.lang.NullPointerException
> at
> org.apache.hadoop.hbase.mapreduce.TableInputFormatBase$TableRecordReader.restart(TableInputFormatBase.java:110)
>  at
> org.apache.hadoop.hbase.mapreduce.TableInputFormatBase$TableRecordReader.init(TableInputFormatBase.java:119)
> at
> org.apache.hadoop.hbase.mapreduce.TableInputFormatBase.createRecordReader(TableInputFormatBase.java:262)
>  at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:588)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:305)
>  at org.apache.hadoop.mapred.Child.main(Child.java:170)
>
> 10/04/09 17:14:30 INFO mapred.JobClient: Job complete:
> job_201004091642_0009
> 10/04/09 17:14:30 INFO mapred.JobClient: Counters: 3
> 10/04/09 17:14:30 INFO mapred.JobClient:   Job Counters
> 10/04/09 17:14:30 INFO mapred.JobClient:     Launched map tasks=4
> 10/04/09 17:14:30 INFO mapred.JobClient:     Data-local map tasks=4
> 10/04/09 17:14:30 INFO mapred.JobClient:     Failed map tasks=1
> 10/04/09 17:14:30 DEBUG zookeeper.ZooKeeperWrapper: Closed connection with
> ZooKeeper
>
>
>
>

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